<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
     <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
     <el-breadcrumb-item>商品管理</el-breadcrumb-item>
     <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon clear :closable="false"></el-alert>
      <!-- 步骤条 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
      <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTableLeave" @tab-click="tabClicked">
        <el-tab-pane label="基本信息" name="0">
          <el-form-item label="商品名称" prop="goods_name">
            <el-input v-model="addForm.goods_name"></el-input>
          </el-form-item>
          <el-form-item label="商品价格" prop="goods_price">
            <el-input v-model="addForm.goods_price" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品重量" prop="goods_weight">
            <el-input v-model="addForm.goods_weight" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品数量" prop="goods_number">
            <el-input v-model="addForm.goods_number" type="number"></el-input>
          </el-form-item>
          <el-form-item label="商品分类" prop="goods_cat">
            <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品参数" name="1">
          <!-- 渲染表单的item项 -->
          <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
            <!-- 复选框组 -->
            <el-checkbox-group v-model="item.attr_vals">
              <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
            </el-checkbox-group>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品属性" name="2">
          <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
            <el-input v-model="item.attr_vals"></el-input>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane label="商品图片" name="3">
          <!-- action表示图片上传到的后台API地址 -->
          <!-- list-type 图片呈现预览效果 -->
          <el-upload :action="uploadURL" :headers="headerObj" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :on-success="handleSuccess">
          <el-button size="mini" type="primary">点击上传</el-button>
          </el-upload>
        </el-tab-pane>
        <el-tab-pane label="商品内容" name="4">
          <!-- 富文本编辑器 -->
          <quill-editor v-model="addForm.goods_introduce"></quill-editor>
          <!-- 添加商品的按钮 -->
          <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
        </el-tab-pane>
      </el-tabs>
      </el-form>
    </el-card>

    <!-- 预览图片的对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return {
      activeIndex: '0',

      addForm:{
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat:[],
        pics:[],
        // 商品的详情描述
        goods_introduce:'',
        attrs:[]
      },
      addFormRules:{
        goods_name: [
          {required: true, message: '请输入商品名称', trigger: 'blur'},
        ],
        goods_price: [
          {required: true, message: '请输入商品价格', trigger: 'blur'},
        ],
        goods_weight: [
          {required: true, message: '请输入商品重量', trigger: 'blur'},
        ],
        goods_number: [
          {required: true, message: '请输入商品数量', trigger: 'blur'},
        ],
        goods_cat:[
          {required: true, message: '请输入商品分类', trigger: 'blur'},
        ]
      },
      // 商品分类列表
      cateList:[],
      
      cateProps:{
        label:'cat_name',
        value:'cat_id',
        children:'children'
      },
      // 动态参数列表
      manyTableData:[],
      // 静态属性列表
      onlyTableData:[],
      // upload url
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头
      headerObj:{
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath:'',
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList(){
      const {data:res} = await this.$http.get('categories')

      if(res.meta.status !== 200) {
        return this.$message.error('获取商品数据失败')
      }

      this.cateList = res.data
      // console.log(this.cateList);
    },
    handleChange(){
      if(this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat.length = []
      }
    },
    beforeTableLeave(activeName, oldActiveName) {
      if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    async tabClicked(){
      // 证明访问的是动态参数面板
      if(this.activeIndex === '1') {
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
        {params:{ sel:'many' }})
        if(res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败')
        }
        console.log(res.data);
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
        {params:{ sel:'only' }})
        if(res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败')
        }
        console.log(res.data);
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file){
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 删除图片
    handleRemove(file){
      // 1.获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中,找到这个图片的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组的splice方法,把图片信息对象,从pics数组中移除
      this.addForm.pics.splice(i,1)
      // console.log(this.addForm);
    },
    // 监听图片上传成功的事件
    handleSuccess(response){
      // 拼接得到一个图片信息对象
      const picInfo = {
        pic: response.data.tmp_path
      }
      // 将图片信息对象,push 到 pics数组中
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm);
    },
    // 添加商品
    add(){
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) {
          return this.$message.error('请填写必要的表单项')
        }
        // 执行添加的业务逻辑
        // lodash 深拷贝
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')

        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo= { attr_id: item.attr_id,attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo= { attr_id: item.attr_id,attr_value: item.attr_vals}
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form);

        // 发起请求添加商品
        // 商品名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        console.log(res)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败!')
        }
        this.$message.success('添加商品成功!')
        this.$router.push('/goods')
      })
    }
  },
  computed:{
    cateId(){
      if(this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>